1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 # ALSA soundcard-configuration 2 # ALSA soundcard-configuration
3 config SND_TIMER 3 config SND_TIMER
4 tristate 4 tristate
5 5
6 config SND_PCM 6 config SND_PCM
7 tristate 7 tristate
8 select SND_TIMER if SND_PCM_TIMER 8 select SND_TIMER if SND_PCM_TIMER
9 9
10 config SND_PCM_ELD 10 config SND_PCM_ELD
11 bool 11 bool
12 12
13 config SND_PCM_IEC958 13 config SND_PCM_IEC958
14 bool 14 bool
15 15
16 config SND_DMAENGINE_PCM 16 config SND_DMAENGINE_PCM
17 tristate 17 tristate
18 18
19 config SND_HWDEP 19 config SND_HWDEP
20 tristate 20 tristate
21 21
22 config SND_SEQ_DEVICE 22 config SND_SEQ_DEVICE
23 tristate 23 tristate
24 24
25 config SND_RAWMIDI 25 config SND_RAWMIDI
26 tristate 26 tristate
27 select SND_SEQ_DEVICE if SND_SEQUENCER 27 select SND_SEQ_DEVICE if SND_SEQUENCER != n
28 28
29 config SND_UMP 29 config SND_UMP
30 tristate 30 tristate
31 select SND_RAWMIDI 31 select SND_RAWMIDI
32 32
33 config SND_UMP_LEGACY_RAWMIDI 33 config SND_UMP_LEGACY_RAWMIDI
34 bool "Legacy raw MIDI support for UMP 34 bool "Legacy raw MIDI support for UMP streams"
35 depends on SND_UMP 35 depends on SND_UMP
36 help 36 help
37 This option enables the legacy raw M 37 This option enables the legacy raw MIDI support for UMP streams.
38 When this option is set, an addition 38 When this option is set, an additional rawmidi device for the
39 legacy MIDI 1.0 byte streams is crea 39 legacy MIDI 1.0 byte streams is created for each UMP Endpoint.
40 The device contains 16 substreams co 40 The device contains 16 substreams corresponding to UMP groups.
41 41
42 config SND_CORE_TEST <<
43 tristate "Sound core KUnit test" <<
44 depends on KUNIT <<
45 select SND_PCM <<
46 default KUNIT_ALL_TESTS <<
47 help <<
48 This options enables the sound core <<
49 <<
50 KUnit tests run during boot and outp <<
51 log in TAP format (https://testanyth <<
52 kernel devs running KUnit test harne <<
53 into a production build. <<
54 <<
55 For more information on KUnit and un <<
56 to the KUnit documentation in Docume <<
57 <<
58 <<
59 config SND_COMPRESS_OFFLOAD 42 config SND_COMPRESS_OFFLOAD
60 tristate 43 tristate
61 44
62 config SND_JACK 45 config SND_JACK
63 bool 46 bool
64 47
65 # enable input device support in jack layer 48 # enable input device support in jack layer
66 config SND_JACK_INPUT_DEV 49 config SND_JACK_INPUT_DEV
67 bool 50 bool
68 depends on SND_JACK 51 depends on SND_JACK
69 default y if INPUT=y || INPUT=SND 52 default y if INPUT=y || INPUT=SND
70 53
71 config SND_OSSEMUL 54 config SND_OSSEMUL
72 bool "Enable OSS Emulation" 55 bool "Enable OSS Emulation"
73 select SOUND_OSS_CORE 56 select SOUND_OSS_CORE
74 help 57 help
75 This option enables the build of OSS 58 This option enables the build of OSS emulation layer.
76 59
77 config SND_MIXER_OSS 60 config SND_MIXER_OSS
78 tristate "OSS Mixer API" 61 tristate "OSS Mixer API"
79 depends on SND_OSSEMUL 62 depends on SND_OSSEMUL
80 help 63 help
81 To enable OSS mixer API emulation (/ 64 To enable OSS mixer API emulation (/dev/mixer*), say Y here
82 and read <file:Documentation/sound/d 65 and read <file:Documentation/sound/designs/oss-emulation.rst>.
83 66
84 Many programs still use the OSS API, 67 Many programs still use the OSS API, so say Y.
85 68
86 To compile this driver as a module, 69 To compile this driver as a module, choose M here: the module
87 will be called snd-mixer-oss. 70 will be called snd-mixer-oss.
88 71
89 config SND_PCM_OSS 72 config SND_PCM_OSS
90 tristate "OSS PCM (digital audio) API" 73 tristate "OSS PCM (digital audio) API"
91 depends on SND_OSSEMUL 74 depends on SND_OSSEMUL
92 select SND_PCM 75 select SND_PCM
93 help 76 help
94 To enable OSS digital audio (PCM) em 77 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
95 here and read <file:Documentation/so 78 here and read <file:Documentation/sound/designs/oss-emulation.rst>.
96 79
97 Many programs still use the OSS API, 80 Many programs still use the OSS API, so say Y.
98 81
99 To compile this driver as a module, 82 To compile this driver as a module, choose M here: the module
100 will be called snd-pcm-oss. 83 will be called snd-pcm-oss.
101 84
102 config SND_PCM_OSS_PLUGINS 85 config SND_PCM_OSS_PLUGINS
103 bool "OSS PCM (digital audio) API - In 86 bool "OSS PCM (digital audio) API - Include plugin system"
104 depends on SND_PCM_OSS 87 depends on SND_PCM_OSS
105 default y 88 default y
106 help 89 help
107 If you disable this option, the ALSA 90 If you disable this option, the ALSA's OSS PCM API will not
108 support conversion of channels, form 91 support conversion of channels, formats and rates. It will
109 behave like most of new OSS/Free dri 92 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
110 93
111 config SND_PCM_TIMER 94 config SND_PCM_TIMER
112 bool "PCM timer interface" if EXPERT 95 bool "PCM timer interface" if EXPERT
113 default y 96 default y
114 help 97 help
115 If you disable this option, pcm time 98 If you disable this option, pcm timer will be unavailable, so
116 those stubs that use pcm timer (e.g. 99 those stubs that use pcm timer (e.g. dmix, dsnoop & co) may work
117 incorrectly. 100 incorrectly.
118 101
119 For some embedded devices, we may di 102 For some embedded devices, we may disable it to reduce memory
120 footprint, about 20KB on x86_64 plat 103 footprint, about 20KB on x86_64 platform.
121 104
122 config SND_HRTIMER 105 config SND_HRTIMER
123 tristate "HR-timer backend support" 106 tristate "HR-timer backend support"
124 depends on HIGH_RES_TIMERS 107 depends on HIGH_RES_TIMERS
125 select SND_TIMER 108 select SND_TIMER
126 help 109 help
127 Say Y here to enable HR-timer backen 110 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
128 the hrtimer as a precise timing sour 111 the hrtimer as a precise timing source. The ALSA sequencer code
129 also can use this timing source. 112 also can use this timing source.
130 113
131 To compile this driver as a module, 114 To compile this driver as a module, choose M here: the module
132 will be called snd-hrtimer. 115 will be called snd-hrtimer.
133 116
134 config SND_DYNAMIC_MINORS 117 config SND_DYNAMIC_MINORS
135 bool "Dynamic device file minor number 118 bool "Dynamic device file minor numbers"
136 help 119 help
137 If you say Y here, the minor numbers 120 If you say Y here, the minor numbers of ALSA device files in
138 /dev/snd/ are allocated dynamically. 121 /dev/snd/ are allocated dynamically. This allows you to have
139 more than 8 sound cards, but require 122 more than 8 sound cards, but requires a dynamic device file
140 system like udev. 123 system like udev.
141 124
142 If you are unsure about this, say N 125 If you are unsure about this, say N here.
143 126
144 config SND_MAX_CARDS 127 config SND_MAX_CARDS
145 int "Max number of sound cards" 128 int "Max number of sound cards"
146 range 4 256 129 range 4 256
147 default 32 130 default 32
148 depends on SND_DYNAMIC_MINORS 131 depends on SND_DYNAMIC_MINORS
149 help 132 help
150 Specify the max number of sound card 133 Specify the max number of sound cards that can be assigned
151 on a single machine. 134 on a single machine.
152 135
153 config SND_SUPPORT_OLD_API 136 config SND_SUPPORT_OLD_API
154 bool "Support old ALSA API" 137 bool "Support old ALSA API"
155 default y 138 default y
156 help 139 help
157 Say Y here to support the obsolete A 140 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
158 or older). 141 or older).
159 142
160 config SND_PROC_FS 143 config SND_PROC_FS
161 bool "Sound Proc FS Support" if EXPERT 144 bool "Sound Proc FS Support" if EXPERT
162 depends on PROC_FS 145 depends on PROC_FS
163 default y 146 default y
164 help 147 help
165 Say 'N' to disable Sound proc FS, wh 148 Say 'N' to disable Sound proc FS, which may reduce code size about
166 9KB on x86_64 platform. 149 9KB on x86_64 platform.
167 If unsure say Y. 150 If unsure say Y.
168 151
169 config SND_VERBOSE_PROCFS 152 config SND_VERBOSE_PROCFS
170 bool "Verbose procfs contents" 153 bool "Verbose procfs contents"
171 depends on SND_PROC_FS 154 depends on SND_PROC_FS
172 default y 155 default y
173 help 156 help
174 Say Y here to include code for verbo 157 Say Y here to include code for verbose procfs contents (provides
175 useful information to developers whe 158 useful information to developers when a problem occurs). On the
176 other side, it makes the ALSA subsys 159 other side, it makes the ALSA subsystem larger.
177 160
>> 161 config SND_VERBOSE_PRINTK
>> 162 bool "Verbose printk"
>> 163 help
>> 164 Say Y here to enable verbose log messages. These messages
>> 165 will help to identify source file and position containing
>> 166 printed messages.
>> 167
>> 168 You don't need this unless you're debugging ALSA.
>> 169
178 config SND_CTL_FAST_LOOKUP 170 config SND_CTL_FAST_LOOKUP
179 bool "Fast lookup of control elements" 171 bool "Fast lookup of control elements" if EXPERT
180 default y 172 default y
181 select XARRAY_MULTI 173 select XARRAY_MULTI
182 help 174 help
183 This option enables the faster looku 175 This option enables the faster lookup of control elements.
184 It will consume more memory because 176 It will consume more memory because of the additional Xarray.
185 If you want to choose the memory foo 177 If you want to choose the memory footprint over the performance
186 inevitably, turn this off. 178 inevitably, turn this off.
187 179
188 config SND_DEBUG 180 config SND_DEBUG
189 bool "Debug" 181 bool "Debug"
190 help 182 help
191 Say Y here to enable ALSA debug code 183 Say Y here to enable ALSA debug code.
192 184
193 config SND_DEBUG_VERBOSE 185 config SND_DEBUG_VERBOSE
194 bool "More verbose debug" 186 bool "More verbose debug"
195 depends on SND_DEBUG 187 depends on SND_DEBUG
196 help 188 help
197 Say Y here to enable extra-verbose d 189 Say Y here to enable extra-verbose debugging messages.
198 190
199 Let me repeat: it enables EXTRA-VERB 191 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
200 So, say Y only if you are ready to b 192 So, say Y only if you are ready to be annoyed.
201 193
202 config SND_PCM_XRUN_DEBUG 194 config SND_PCM_XRUN_DEBUG
203 bool "Enable PCM ring buffer overrun/u 195 bool "Enable PCM ring buffer overrun/underrun debugging"
204 default n 196 default n
205 depends on SND_DEBUG && SND_VERBOSE_PR 197 depends on SND_DEBUG && SND_VERBOSE_PROCFS
206 help 198 help
207 Say Y to enable the PCM ring buffer 199 Say Y to enable the PCM ring buffer overrun/underrun debugging.
208 It is usually not required, but if y 200 It is usually not required, but if you have trouble with
209 sound clicking when system is loaded 201 sound clicking when system is loaded, it may help to determine
210 the process or driver which causes t 202 the process or driver which causes the scheduling gaps.
211 203
212 config SND_CTL_INPUT_VALIDATION 204 config SND_CTL_INPUT_VALIDATION
213 bool "Validate input data to control A 205 bool "Validate input data to control API"
214 help 206 help
215 Say Y to enable the additional valid 207 Say Y to enable the additional validation for the input data to
216 each control element, including the 208 each control element, including the value range checks.
217 An error is returned from ALSA core 209 An error is returned from ALSA core for invalid inputs without
218 passing to the driver. This is a ki 210 passing to the driver. This is a kind of hardening for drivers
219 that have no proper error checks, at 211 that have no proper error checks, at the cost of a slight
220 performance overhead. 212 performance overhead.
221 213
222 config SND_CTL_DEBUG 214 config SND_CTL_DEBUG
223 bool "Enable debugging feature for con 215 bool "Enable debugging feature for control API"
224 depends on SND_DEBUG 216 depends on SND_DEBUG
225 help 217 help
226 Say Y to enable the debugging featur 218 Say Y to enable the debugging feature for ALSA control API.
227 It performs the additional sanity-ch 219 It performs the additional sanity-checks for each control element
228 read access, such as whether the val 220 read access, such as whether the values returned from the driver
229 are in the proper ranges or the chec 221 are in the proper ranges or the check of the invalid access at
230 out-of-array areas. The error is pr 222 out-of-array areas. The error is printed when the driver gives
231 such unexpected values. 223 such unexpected values.
232 When you develop a driver that deals 224 When you develop a driver that deals with control elements, it's
233 strongly recommended to try this one 225 strongly recommended to try this one once and verify whether you see
234 any relevant errors or not. 226 any relevant errors or not.
235 227
236 config SND_JACK_INJECTION_DEBUG 228 config SND_JACK_INJECTION_DEBUG
237 bool "Sound jack injection interface v 229 bool "Sound jack injection interface via debugfs"
238 depends on SND_JACK && SND_DEBUG && DE 230 depends on SND_JACK && SND_DEBUG && DEBUG_FS
239 help 231 help
240 This option can be used to enable or 232 This option can be used to enable or disable sound jack
241 software injection. 233 software injection.
242 Say Y if you are debugging via jack 234 Say Y if you are debugging via jack injection interface.
243 If unsure select "N". 235 If unsure select "N".
244 236
245 config SND_UTIMER <<
246 bool "Enable support for userspace-con <<
247 depends on SND_TIMER <<
248 help <<
249 Say Y to enable the support of users <<
250 timers are purely virtual, and they <<
251 from userspace. They could be quite <<
252 sound timing with userspace applicat <<
253 data through snd-aloop). <<
254 <<
255 config SND_VMASTER 237 config SND_VMASTER
256 bool 238 bool
257 239
258 config SND_DMA_SGBUF 240 config SND_DMA_SGBUF
259 def_bool y 241 def_bool y
260 depends on X86 242 depends on X86
261 243
262 config SND_CTL_LED 244 config SND_CTL_LED
263 tristate 245 tristate
264 select NEW_LEDS if SND_CTL_LED 246 select NEW_LEDS if SND_CTL_LED
265 select LEDS_TRIGGERS if SND_CTL_LED 247 select LEDS_TRIGGERS if SND_CTL_LED
>> 248 select LEDS_TRIGGER_AUDIO if SND_CTL_LED
266 249
267 source "sound/core/seq/Kconfig" 250 source "sound/core/seq/Kconfig"
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